Gaming system and method of gaming

ABSTRACT

The present invention relates to a gaming system and to a method of gaming A game is played by displaying a representation of selection of a plurality of symbols from a set of symbols. The game enables selection of at least one additional symbol in addition to those originally selected, to increase the number of symbol combinations available for assessing a game outcome. In an example, the additional symbol is displayed as being mounted on a substrate which is “flipped” to reveal the additional symbol. Another face of this substrate mounts the originally selected symbol. A plurality of additional symbols may be available for selection.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of and claims priority to patentapplication Ser. No. 12/339,720, filed on Dec. 19, 2008, entitled “AGAMING SYSTEM AND METHOD OF GAMING”, which claims the benefit ofpriority to Australian Provisional Patent Application No. 2007907070,filed on Dec. 21, 2007, entitled “A GAMING SYSTEM AND A METHOD OFGAMING”, each of which is hereby incorporated by reference in itsentirety for all purposes.

FIELD OF THE INVENTION

The present invention relates to a gaming system and to a method ofgaming.

BACKGROUND OF THE INVENTION

It is known to provide a gaming system which comprises a game controllerarranged to randomly select and cause the display of several symbolsfrom a predetermined set of symbols and to determine a game outcome,such as a game win, based on the displayed symbols. Such gaming systemsmay commonly be implemented as a stepping machine provided with reelswith each reel carrying several symbols of the set, or a video machinewherein selected symbols are displayed on virtual reels on a graphicaldisplay device. Win outcomes can occur based on symbols appearing in oneor more horizontal lines, diagonal lines, or any other predeterminedway. Typically five reels across are provided on the display (althoughless or more may be provided). Each reel or virtual reel display isthree symbols high in the display window for the reel (although, again,this may be more or less symbols high).

In many gaming systems, a player can choose whether or not to wager onone or more win lines for each play of the game. The value of the wagerfor each win line may be determined by the player. A prize awarded tothe player for a winning combination on a win line will generally be inproportion to the amount of credits bet for that win line by the player.This is perceived to be fair, as the more credits that the player iswilling to risk, the higher the potential return.

While it is a simple matter to scale the amount of prize return withregard to the amount of credit bet by the player for prizes that are ofknown value for a winning combination, it is not possible to do this forjackpot prizes, which accumulate over a period of time, or prizes offixed value, e.g. a car. Jackpot prizes may, for example, depend on apercentage amount of credits entered into a gaming system over a periodof time, or even a percentage amount of credits entered into linkedgaming machines (linked jackpots) over a period of time. Winning of thejackpot is generally independent of the amount of credit wagered on anyparticular win line by a player. This is perceived as being unfair toplayers who are willing to wager large amounts of credit in order to wina jackpot.

SUMMARY OF THE INVENTION

In accordance with a first aspect, the present invention provides agaming system, including a game controller arranged to control play of agame, and a display arranged to display a representation of play of thegame, the game controller being arranged to select a plurality ofsymbols from a set of symbols for play of the game, and to control thedisplay to display a plurality of the selected symbols in one or both ofrows and columns, the game controller being arranged to select at leastone additional symbol, and to control the display to display theadditional symbol in place of one of the originally selected symbols.

In an embodiment, the game controller is arranged to determine a gameoutcome based on the symbol selection. In an embodiment, providing theat least one additional symbol enables more combinations of symbols tobe achieved for the determination of game outcomes.

In an embodiment, the game controller is arranged to select a pluralityof additional symbols.

In an embodiment, the game controller is arranged to control the displayto display the additional symbol by appearing to turn over theoriginally selected symbol to reveal the additional symbol behind theoriginally selected symbol. In an embodiment, the display is controlledsuch that the originally selected symbol appears to be mounted on a faceof a substrate which appears to turn over so that another face of thesubstrate appears bearing the additional symbol. In an embodiment, thedisplay is controlled such that the originally selected symbol appearsto be mounted on one face of a three dimensional substrate having aplurality of faces, the substrate appearing to turn so that another ofthe faces of the three dimensional substrate appears bearing theadditional symbol. In this embodiment, further turns of the threedimensional substrate may reveal further additional symbols. The threedimensional substrate may be a triangular prism, a rectangular prism, ora multi sided prism. The three dimensional substrate may be of anyshape, with any number of faces. These embodiments have the advantage ofcreating a graphically interesting game operation in order to increaseplayer entertainment and interest.

In an embodiment, the game may be played utilising player credit. In anembodiment, an opportunity to obtain one or more additional symbols maybe bought by the player, based on credit input by the player. In oneembodiment, an additional symbol may include a jackpot symbol, which,together with other jackpot symbols in a combination, may enable aplayer to win a jackpot if the symbol appears in the appropriatepattern. In an embodiment, a number of jackpot symbols available asadditional symbols increases in proportion to the amount of creditwagered by the player, whereby to increase the chances of the playerbeing able to win a jackpot in dependence upon the amount of creditwagered. This embodiment has the advantage that players who are willingto gamble higher amounts of credit to win the jackpot have a betterchance of winning the jackpot, which is perceived to be fairer thanprior art gaming machines where a chance of winning the jackpot does notvary in dependence on the amount wagered.

In accordance with a second aspect, the present invention provides amethod of gaming, including the steps of selecting a plurality ofsymbols from a set of symbols for play of a game, controlling a displayto display at least a plurality of the selected symbols in symbolpositions in one or both of rows and columns, selecting at least oneadditional symbol and controlling the display to display the additionalsymbol in the place of one of the originally selected symbols.

In accordance with a third aspect, the present invention provides acomputer program including instructions for controlling a computer toimplement a gaming system in accordance with the first aspect of theinvention.

In accordance with a fourth aspect, the present invention provides acomputer readable medium providing a computer program in accordance withthe third aspect of the invention.

In accordance with a fifth aspect, the present invention provides a datasignal including a computer program in accordance with the third aspectof the invention.

BRIEF DESCRIPTION OF THE FIGURES

Features and advantages of certain embodiments of the present inventionwill become apparent from the following description of embodimentsthereof, by way of example only, with reference to the accompanyingdrawings, in which;

FIG. 1 is a schematic block diagram of core components of a gamingsystem in accordance with an embodiment of the present invention;

FIG. 2 is a diagrammatic representation of a gaming system in accordancewith an embodiment of the present invention with the gaming systemimplemented in the form of a stand alone gaming machine;

FIG. 3 is a schematic block diagram of operative components of thegaming machine shown in FIG. 2;

FIG. 4 is a schematic block diagram of components of a memory of thegaming machine shown in FIG. 2;

FIG. 5 is a schematic diagram of a gaming system in accordance with analternative embodiment of the present invention with the gaming systemimplemented over a network;

FIG. 6 is a schematic diagram of functional components of a gamingsystem in accordance with an embodiment of the present invention;

FIGS. 7 to 12 are representations of example displays generated by agaming system in accordance with an embodiment of the present invention,and

FIG. 13 is a flow diagram illustrating operation of a gaming system inaccordance with an embodiment of the present invention.

The foregoing summary, as well as the following detailed description ofcertain embodiments of the present invention, will be better understoodwhen read in conjunction with the appended drawings. For the purpose ofillustrating the invention, certain embodiments are shown in thedrawings. It should be understood, however, that the present inventionis not limited to the arrangements and instrumentality shown in theattached drawings.

DETAILED DESCRIPTION OF CERTAIN EMBODIMENTS

Referring to the drawings, there is shown a gaming system arranged toimplement a game in which a plurality of symbols from a set of symbolsis selected and displayed in symbol positions in one or both of rows andcolumns. In this embodiment (see FIG. 7) an example display 400 displayssymbols 401 in a plurality of rows and columns. In this embodiment, thegaming system is arranged to select at least one additional symbol andcontrol the display to display the at least one additional symbolreplacing an originally selected symbol. In this example, the originalsymbol being replaced is represented as being mounted by substrate 402which is “flipped” (see FIG. 8) to reveal an additional symbol 403 (FIG.9, for example) on the reverse side of the substrate 402. Provision ofthe additional symbols advantageously enables the gaming system to offermore combinations of symbols to the player, more chance of winning aprize and potentially higher value prizes. In one embodiment, this alsoenables a number of jackpot winning symbols available to be increased inaccord with the amount of credit bet by the player.

The gaming system can take a number of different forms.

In a first form, a stand alone gaming machine is provided wherein all ormost components for implementing the game are present in a playeroperable gaming machine.

In a second form, a distributed architecture is provided wherein some ofthe components for implementing the game are present in a playeroperable gaming machine and some of the components for implementing thegame are located remotely relative to the gaming machine. For example, a“thick client” architecture may be used wherein part of the game isexecuted on a player operable gaming machine and part of the game isexecuted remotely, such as by a gaming server; or a “thin client”architecture may be used wherein most of the game is executed remotelysuch as by a gaming server and a player operable gaming machine is usedonly to display audible and/or visible gaming information to the playerand receive gaming inputs from the player.

However, it will be understood that other arrangements are envisaged.For example, an architecture may be provided wherein a gaming machine isnetworked to a gaming server and the respective functions of the gamingmachine and the gaming server are selectively modifiable. For example,the gaming system may operate in stand alone gaming machine mode, “thickclient” mode or “thin client” mode depending on the game being played,operating conditions, and so on. Other variations will be apparent topersons skilled in the art.

Irrespective of the form, the gaming system includes several corecomponents. At the broadest level, the core components are a playerinterface 50 and a game controller 60 as illustrated in FIG. 1. Theplayer interface is arranged to enable manual interaction between aplayer and the gaming system and for this purpose includes theinput/output components for the player to enter instructions and playthe game.

Components of the player interface may vary from embodiment toembodiment but will typically include a credit mechanism 52 to enable aplayer to input credits and receive payouts, one or more displays 54, agame play mechanism 56 that enables a player to input game playinstructions (e.g. to place bets), and one or more speakers 58.

The game controller 60 is in data communication with the playerinterface and typically includes a processor 62 that processes the gameplay instructions in accordance with game play rules and outputs gameplay outcomes to the display. Typically, the game play instructions arestored as program code in a memory 64 but can also be hardwired. Hereinthe term “processor” is used to refer generically to any device that canprocess game play instructions in accordance with game play rules andmay include: a microprocessor, microcontroller, programmable logicdevice or other computational device, a general purpose computer (e.g. aPC) or a server.

A gaming system in the form of a stand alone gaming machine 10 isillustrated in FIG. 2. The gaming machine 10 includes a console 12having a display 14 on which is displayed representations of a game 16that can be played by a player. A mid-trim 20 of the gaming machine 10houses a bank of buttons 22 for enabling a player to interact with thegaming machine, in particular during gameplay. The mid-trim 20 alsohouses a credit input mechanism 24 which in this example includes a coininput chute 24A and a bill collector 24B. Other credit input mechanismsmay also be employed, for example, a card reader for reading a smartcard, debit card or credit card. A player marketing module (not shown)having a reading device may also be provided for the purpose of readinga player tracking device, for example as part of a loyalty program. Theplayer tracking device may be in the form of a card, flash drive or anyother portable storage medium capable of being read by the readingdevice.

A top box 26 may carry artwork 28, including for example pay tables anddetails of bonus awards and other information or images relating to thegame. Further artwork and/or information may be provided on a frontpanel 29 of the console 12. A coin tray 30 is mounted beneath the frontpanel 29 for dispensing cash payouts from the gaming machine 10.

The display 14 shown in FIG. 2 is in the form of a video display unit,particularly a cathode ray tube screen device. Alternatively, thedisplay 14 may be a liquid crystal display, plasma screen, any othersuitable video display unit, or the visible portion of anelectromechanical device. The top box 26 may also include a display, forexample a video display unit, which may be of the same type as thedisplay 14, or of a different type.

FIG. 3 shows a block diagram of operative components of a typical gamingmachine which may be the same as or different to the gaming machine ofFIG. 2.

The gaming machine 100 includes a game controller 101 having a processor102. Instructions and data to control operation of the processor 102 arestored in a memory 103, which is in data communication with theprocessor 102. Typically, the gaming machine 100 will include bothvolatile and non-volatile memory and more than one of each type ofmemory, with such memories being collectively represented by the memory103.

The gaming machine has hardware meters 104 for purposes includingensuring regulatory compliance and monitoring player credit, aninput/output (I/O) interface 105 for communicating with peripheraldevices of the gaming machine 100. The input/output interface 105 and/orthe peripheral devices may be intelligent devices with their own memoryfor storing associated instructions and data for use with theinput/output interface or the peripheral devices. A random numbergenerator module 113 generates random numbers for use by the processor102. Persons skilled in the art will appreciate that the reference torandom numbers includes pseudo-random numbers.

In the example shown in FIG. 3, a player interface 120 includesperipheral devices that communicate with the game controller 101 includeone or more displays 106, a touch screen 107 (note that in otherembodiments buttons or other player interface could be used), a cardand/or ticket reader 108, a printer 109, a bill acceptor and/or coininput mechanism 110 and a coin output mechanism 111. Additional hardwaremay be included as part of the gaming machine 100, or hardware may beomitted based on the specific implementation.

In addition, the gaming machine 100 may include a communicationsinterface, for example a network card 112. The network card may, forexample, send status information, accounting information or otherinformation to a central controller, server or database and receive dataor commands from the central controller, server or database.

FIG. 4 shows a block diagram of the main components of an exemplarymemory 103. The memory 103 includes RAM 103A, EPROM 103B and a massstorage device 103C. The RAM 103A typically temporarily holds programfiles for execution by the processor 102 and related data. The EPROM103B may be a boot ROM device and/or may contain some system or gamerelated code. The mass storage device 103C is typically used to storegame programs, the integrity of which may be verified and/orauthenticated by the processor 102 using protected code from the EPROM103B or elsewhere.

It is also possible for the operative components of the gaming machine100 to be distributed, for example input/output devices106,107,108,109,110,111 to be provided remotely from the game controller101.

FIG. 5 shows a gaming system 200 in accordance with an alternativeembodiment. The gaming system 200 includes a network 201, which forexample may be an Ethernet network. Gaming machines 202, shown arrangedin three banks 203 of two gaming machines 202 in FIG. 5, are connectedto the network 201. The gaming machines 202 provide a player operableinterface and may be the same as the gaming machines 10,100 shown inFIGS. 2 and 3, or may have simplified functionality depending on therequirements for implementing game play. While banks 203 of two gamingmachines are illustrated in FIG. 5, banks of one, three or more gamingmachines are also envisaged.

One or more displays 204 may also be connected to the network 201. Thedisplays 204 may, for example, be associated with one or more banks 203of gaming machines. The displays 204 may be used to displayrepresentations associated with game play on the gaming machines 202,and/or used to display other representations, for example promotional orinformational material.

In a thick client embodiment, game server 205 implements part of thegame played by a player using a gaming machine 202 and the gamingmachine 202 implements part of the game. With this embodiment, as boththe game server and the gaming device implement part of the game, theycollectively provide a game controller. A database management server 206may manage storage of game programs and associated data for downloadingor access by the gaming devices 202 in a database 206A. Typically, ifthe gaming system enables players to participate in a Jackpot game, aJackpot server 207 will be provided to monitor and carry out the Jackpotgame. A loyalty program server 212 may also be provided.

In a thin client embodiment, game server 205 implements most or all ofthe game played by a player using a gaming machine 202 and the gamingmachine 202 essentially provides only the player interface. With thisembodiment, the game server 205 provides the game controller. The gamingmachine will receive player instructions, pass these to the game serverwhich will process them and return game play outcomes to the gamingmachine for display. In a thin client embodiment, the gaming machinescould be computer terminals, e.g. PCs running software that provides aplayer interface operable using standard computer input and outputcomponents.

Servers are also typically provided to assist in the administration ofthe gaming network 200, including for example a gaming floor managementserver 208, and a licensing server 209 to monitor the use of licensesrelating to particular games. An administrator terminal 210 is providedto allow an administrator to run the network 201 and the devicesconnected to the network.

The gaming system 200 may communicate with other gaming systems, otherlocal networks, for example a corporate network, and/or a wide areanetwork such as the Internet, for example through a firewall 211.

Persons skilled in the art will appreciate that in accordance with knowntechniques, functionality at the server side of the network may bedistributed over a plurality of different computers. For example,elements may be run as a single “engine” on one server or a separateserver may be provided. For example, the game server 205 could run arandom generator engine. Alternatively, a separate random numbergenerator server could be provided. Further, persons skilled in the artwill appreciate that a plurality of games servers could be provided torun different games or a single game server may run a plurality ofdifferent games based on the terminals.

Referring to FIG. 6, the functionality of embodiments of the presentinvention may be implemented by a game controller having the functionalcomponents illustrated. In this embodiment, the functional componentsare implemented utilising a processor and memory (such as processor 102and memory 103 in FIG. 3, or processor 62 and memory 64 in FIG. 1, forthe game server 205 in FIG. 5), and associated programming. Otherimplementations are envisaged. For example the functional blocks of FIG.6 may be implemented in hardware as separate units, or a combination ofhardware and software as separate units. Any practical implementation ofthese functional units may be employed.

In this embodiment, the game controller 300 is arranged to control thegaming system to play a game which includes selection of a plurality ofsymbols from a set of symbols. The game is implemented as a “reel” game.The game controller 300 includes a display controller 301 which isarranged to control the display (reference numerals 54, 14, 106, 204 ofprevious figures) to emulate a representation of reels bearing symbols.Alternatively, the display may include a stepper motor and physicalreels bearing the symbols.

The game controller 300 includes a symbol selector 302 which is arrangedto select a plurality of symbols from a set of symbols available in asymbol store 303. An outcome generator 304 is arranged to determine anoutcome of the game. In this embodiment, the outcome of the game dependson the selected symbols and may include a win outcome, loss outcome,trigger outcome, a feature outcome or other outcome. Outcomes may bedetermined on the basis of symbols appearing in one or more horizontallines, diagonal lines, or any other pre-determined combinations.

FIG. 7 shows a representation of a gaming machine display 400 which, inthe example shown, has five reels (numbered “1” to “5”). The display 400shows three reel positions high when the reels have stopped/the symbolshave been selected. The reel positions are designated Bottom (“B”),Centre (“C”) and Top (“T”). This is a typical reel-type display for agaming machine. It will be appreciated that in other embodiments thenumber of reel positions may be more or less than in display 400. Alsothe number of reels may be more or less than in the display 400.

The reels may be virtual reels, generated as a video display from theselected symbols, actual mechanical reels carrying the symbols anddriven by a stepper motor, or any other reel arrangement or emulation.In the case of actual physical reels, the game controller drives astepper motor to randomly select the symbols appearing in the display400.

The game outcome is determined by the outcome generator 304 based oncombinations of symbols selected and appearing in the display 400. Thesymbols may be any symbols. As will be appreciated, many different typesof symbols are used in gaming systems. A set of symbols may includestandard symbols and function symbols. For example, standard symbols mayresemble fruit such as apples, pears and bananas with a win outcomebeing determined when a predetermined number of the same fruit appear ona display in the same line, scattered, and so on. The functionassociated with a function symbol may be a “wild” function whereindisplay of the function symbol is treated during consideration of thegame outcome as any of the standard symbols. Other functions may includescatter functions, multiplier functions, repeat win functions, jackpotfunctions and feature commencement functions.

In the example shown in FIG. 7, the symbols are representations ofcards. In this example, a winning hand appearing on the C line may causethe outcome generator to determine that a Win has occurred and that anappropriate prize may be awarded. For example, five of a kind (e.g. 5jacks “J”. 5 tens “10” etc) on the C line may result in a win.

In addition to the card symbols there are other symbols, including“traffic light” 405 symbols which may be function symbols and also “wildcard” symbols 404. In this example, there are also “jackpot” symbolswhich, when selected, enable a jackpot prize to be awarded. A jackpotsymbol is shown as reference 403 in FIG. 9.

The diagram shown in FIG. 7 is one way of representing the symbols only.It will be appreciated that in other embodiments of the inventionsymbols may be represented in different ways, using any type of fancyartwork, or in any appropriate manner.

Operation of an embodiment of the present invention will now bedescribed with reference to FIGS. 7 through 10.

Referring to FIG. 7, the symbol selector 302 selects a plurality ofsymbols from symbols available from the symbol store 303. The gamecontroller 300 operates via the display controller 301 to emulatespinning of reels in the display 400. The selected symbols 401 are “spunup” on the reels. This is how a conventional video animated reelspinning game operates. A game outcome is determined by the outcomegenerator 304 depending upon line or scattered combinations (or otherfeatures, such as bonus awards) of the symbols appearing in the display400. With this basic reel game, however, there are a limited number ofsymbol combinations available. In this embodiment of the invention, inorder to provide further opportunities for awarding of prizes toplayers, the game controller 300 is also arranged to select additionalsymbols which may be used to provide additional opportunities forcombinations which may lead to prize winning results.

In this embodiment, the additional symbols may be revealed by “flipping”originally selected symbols, the additional symbols appearing on thereverse side of the “flipped” originally selected symbol. In thisexample, the selected symbols are displayed as being mounted by asubstrate 402 which the display controller 301 controls so that thesubstrate 402 appears to turn over (“flip”) so that any symbol on theother side of the substrate 402 is revealed. FIG. 8 shows four symbolsin the process of being flipped. FIG. 9 shows the flips in the processof being completed. The reverse side of three of the substrates 402 areblank, no additional symbols being provided for these. On the flippedsymbol in column 1, however, a “minor jackpot” symbol is revealed. FIG.10 shows the display 400 after the symbol flips have been completed.

Providing a facility for additional symbols to be awarded to a playerand for graphics to display those additional symbols by flipping theoriginally selected symbols to reveal the additional symbols, providesadditional opportunities for a player to win prizes as well as agraphically entertaining game.

In the example game illustrated in FIGS. 7 to 10, any jackpot symbolthat is spun up or achieved by a flip, gives the player a chance ofwinning a jackpot. The jackpot may be a linked jackpot (several machinescontributing to central jackpot) or a jackpot of a stand alone machine.In this particular game, when three “mini jackpot” symbols are spun up,a mini jackpot is won, when four “minor jackpots” symbols are spun up, aminor jackpot is won and when five “major jackpot” symbols are spun up amaximum jackpot is won. If no jackpot is won, but a jackpot symbol isrevealed, a small amount of credits are paid to the player to avoiddisappointment of the player. In the example shown in FIG. 10, a minorjackpot symbol has been revealed by a flip in column 1, row T and asmall amount of credit is allocated to the player for the minor jackpotsymbol.

The awarding of one or more “flips” to a player may be caused by anytrigger criteria. Triggers may include a measurement of time that theplayer has been playing the machine, a particular amount of waitingactivity on that machine, it may be based on playing player trackinginformation, or may be a random event, or based on a particularcombination being spun up in the original symbol selection, or any othertrigger. It may be based on a combination of these criteria.

Whether or not a player is awarded one or more flips may also be basedon player credit. In this embodiment, for example, the player has theoption to “buy” a number of flips by increasing the amount of creditthat they bet on the game e.g. that they bet on particular pay lines ofthe game.

The ability to buy additional symbols in the form of flips can address aperceived problem with the chance of winning jackpots. A problem withjackpots is that the winning of a jackpot is generally independent ofthe number of credit units wagered by a player. Players who are willingto bet more credits to win a jackpot e.g. more credits per line, haveonly as much chance as a player who is willing to bet only a smallnumber of credits per line. This is perceived as being unfair to playerswho are willing to gamble higher (in order to win the jackpot) thanother players.

In this embodiment, a player who bets more credits may receive moresymbol flips, giving them additional chances to obtain jackpot symbols,for example, and therefore a better chance of winning a jackpot.

In this embodiment, the number of flips increases in proportion to theamount of credit a player is willing to wager. Also, a number of jackpotsymbols available for selection from the symbol store, as additionalsymbols being available to be flipped, may also increase in proportionto the amount of credit wagered, so that a player has a better chance ofwinning the jackpot if they wager more credits.

In one variation of this game, the right to flip symbols occurs if, inany of the original symbols selected, the player receives at least onejackpot symbol on a pay line. For example, a player spins the reels andgets jackpot symbol and A, K, Q, 10 on the reels. A player who pays onlyone credit per line merely gets to flip one symbol. The best result thatthe player can get with one flip is two jackpot symbols which awards arelatively low prize.

A player who pays four credits per line, however, gets to flip all fournon jackpot symbols on the same line, which gives them a moresubstantial chance for improving to a jackpot. If a player bets tencredits per line, they get ten flips so that the symbols can flipmultiple times (for example where the symbol bearing substrate is multisided, see later on in this description with regard to FIG. 12).

In this embodiment, the number of flips available is changed to matchthe bet and the method of winning the jackpot. If a jackpot is triggeredby a combination on a line, for example, the number of flips will matchthe bet per line. If a jackpot triggered on a scattered combination, thenumber of flips will match the bet per line times the cost of the linespurchased (e.g. bet fifty lines at one credit buys two lines at fivecredits per line, the number of flips is 25×5=75).

FIG. 11 shows an example where four flips have been awarded to theplayer and three of these are major jackpot 406 symbols. The player maywin a prize for three jackpot symbols (the jackpot is won by fivejackpot symbols in the embodiment of FIG. 11).

FIG. 12 shows an embodiment of the invention where the display iscontrolled such that the originally selected symbol appears to bemounted on a face of a three dimensional substrate 410 having aplurality of faces. In the embodiment of FIG. 12 the three dimensionalsubstrate is represented as a triangular prism. Each face may bear asymbol (such as a “maxi jackpot” as shown in FIG. 12) or may be blank.

The following description gives two examples of how a game may be playedin accordance with an embodiment of the present invention:

Example 1 Winning a Jackpot by Combinations on a Line

Player is playing 3 lines and bet 5 credits per line.

Jackpots are won as follows

3 jackpot symbols on a line pay a mini jackpot

4 jackpot symbols on a line pay a minor jackpot

5 jackpot symbols on a line pay a major jackpot

The rules of the game define

-   1. The player has the right to flip a symbol whenever one or more    jackpot symbols appears on a purchased payline.-   2. The number of flips is equal to the number of credits bet per    line.-   3. A symbol can be flipped more than once-   4. The reel strips remain constant for all bets per line. (the    chance of getting jackpot symbol on a line is 1 in 10)

The reels spin and the player sees

A K Q J 10 9 WILD JACKPOT A K J 10 9 Q A

No prize is payable but because a Jackpot symbol is on a purchasedpayline, the player has the right to flip. The number of flips is equalto the bet per line which is 5.

The player flips the symbols on the centre line on reels 1, 4 and 5

The result is

A K Q J 10 JACKPOT WILD JACKPOT 10  7 J 10 9 Q A

The player has 2 flips remaining. The player selects to flip the centreline reels 4 and 5

The result is

A K Q J 10 JACKPOT WILD JACKPOT JACKPOT  9 J 10 9 Q A

The outcome is evaluated and the player has 4 jackpots on the centreline. (Wild substitutes for jackpot).

Player wins the minor jackpot.

If the player had bet 1 credits with 1 credit per line, the chance of 3or more jackpot symbols occurring on a line is 1 in 1000.

If the player had bet 3 credits with 1 credit per line on 3 lines, thechance of 3 or more jackpot symbols occurring on a line is 1 in 1000.The chance of winning on any line is 3 in 1000. For a bet of 3 thechance of win is 1 in 1000.

This player bet 15 credits, has 3 chances (3 lines) to win a jackpot.The chance of 3 or more jackpot symbols occurring on a line is 1 in1000. The chance of winning on any line is 3 in 1000. This is not faircompared to the player betting 1 credit per line, so this player isgiven the chance to flip. The chances of selecting jackpot symbols byflipping are increased so that after flipping the chance of winning ajackpot on a line is 5 in 1000. Thus the player has bet 15 credits andhas 3 lines on which to win at the chance of 5 in 1000. The total chanceper credit bet is 1 in 1000.

Example 2 Winning a Jackpot by Combinations Scattered Anywhere in theWindow

Player is playing 3 lines and bet 5 credits per line.

Jackpots are won as follows

3 jackpot symbols anywhere in the window pay a mini jackpot

4 jackpot symbols anywhere in the window pay a minor jackpot

5 jackpot symbols anywhere in the window pay a major jackpot

The rules of the game define

-   1. The player has the right to flip a symbol whenever one or more    jackpot symbols appears anywhere in the window.-   2. The number of flips is equal to the number of credits bet per    line multiplied by the number of lines played.-   3. A symbol can be flipped more than once-   4. The reel strips remain constant for all bets per line.

The reels spin and the player sees

A K Q J 10 9 J JACKPOT A K J 10 9 Q A

No prize is payable but because a Jackpot symbol is in the window, theplayer has the right to flip. The number of flips is equal to the betper line multiplied by the number of lines played which is 5*3=15.

The player flips the symbols on the centre line on reels 1, 2, 4 and 5and all symbols on the top line and all symbols on the bottom line

The result is

10 9 Q K JACKPOT A K JACKPOT J 7 Q J 10 JACKPOT K

The player has 1 flip remaining. The player selects to flip the centreline reel 1

The result is

10 9 Q K JACKPOT JACKPOT K JACKPOT J 7 Q J 10 JACKPOT K

The outcome is evaluated and the player has 4 jackpots in the window.Player wins the minor jackpot.

The above examples are two examples only of the types of games that maybe played using the present invention. It will be appreciated that thepresent invention may be implemented in a number of other ways,depending upon game design.

A game playing process in accordance with an embodiment of the presentinvention will now be summarised with reference to FIG. 13. At step 700the game is played by selection of symbols from the symbol store 303 bythe symbol selector 302. At step 701, determination is made as towhether or not any additional symbols are available (this may depend onplayer credit, a combination of symbols appearing in the originallyselected symbols, or any other trigger, as discussed above). If a flipis available, at step 702 a determination is made of the number of flipsavailable. For example, in this embodiment the number of flips dependsupon the amount of player credit per line entered. The amount of creditis determined and the number of flips is determined. At step 703 theflips are carried out and any additional symbols are revealed. If noflip is available, the game outcome is determined at step 704, on thebasis of only the originally selected symbols. Where a flip hasoccurred, the next step is to determine the game outcome (step 704)based on the additional symbols.

In the above described embodiment, the originally selected symbols areflipped to reveal jackpot symbols or blanks. The additional symbols arenot limited to jackpot symbols or blanks. Any additional symbol may berevealed by a flip, depending upon the game being played. For example,if the game being played is a poker type game, additional card symbolsmay be revealed by the flip to improve the player's hand. In a furtherexample, a jackpot may be won by a particular combination of standardsymbols e.g. card symbols, and the flip may enable the combination to becompleted if the appropriate symbol is revealed by the flip.

In the above described embodiment, the game example shows the use ofadditional symbols to improve the chances of a player winning a jackpot.This invention is not limited to providing games with improved jackpotchances. Additional symbols may be utilised to provide more chance ofwinning any type of prize, including a combination, a feature, a bonusor any other type of prize.

In the above embodiment, the symbols “flip” anti clockwise. Theinvention is not limited to this. The symbols may flip clockwise or maybe flipped over and under or in any other way or direction. In otherembodiments, the symbols may not be represented as flipping at all. Onesymbol may merely be replaced by another symbol, for example.

In the above embodiment, single symbols are flipped. The invention isnot limited to this. Two symbols mounted by the same substrate may beflipped, or three symbols or more. The substrate in this case bears aplurality of symbols and may flip to reveal a plurality of symbols, or asingle symbol.

In the above examples, the player is allowed to select from a pluralityof symbols those which he wishes to flip. A plurality of availablesymbols for flipping may or may not be indicated to the player.Indication may be visual and/or audio e.g. by changing the colour of thesymbol to be flipped, changing or adding a border around the symbol tobe flipped, or any other manner of identification of the symbol to beflipped. In an embodiment, all of the symbols appearing on the screenmay be available to be flipped (up to the number of flips available forthe player). In other embodiments, the player may not get to selectwhich symbols flip. For example, the game controller may determine whichsymbols are to be flipped and the flip may be carried out automatically.

In the above described embodiments, the display emulates a plurality ofreels. In an alternative embodiment, the original symbol selection maybe implemented as actual reels driven by a stepper motor. Additionalsymbols may be added by video graphics overlaying the display of theactual stepper reels. In another alternative embodiment, the replacementsymbol may appear on another display. That is, the stepper position tobe replaced is selected, and then a video display (which could be placedin the top box or adjacent the reels strips) displays the replacementsymbol. In an alternative embodiment, a mechanical arrangement could beused to change the symbols on the stepper reels.

In another embodiment, the display may not emulate reels but merely showthe selected symbols in a non-reel format e.g. presenting or emulatingplaying cards, or other graphical representations in a series of rowsand columns.

In the embodiment described above where the player is provided with anincreased chance of winning a jackpot in direct proportion to the amountof credit bet, it can be readily seen and understood by the player thatthe more that is bet, the more chances of flipping symbols are provided.This is an appealing way of representing to a player that they get morechances from more money bet.

Embodiments of the present invention may be implemented utilisingprogram code. The program code may be supplied in a number of ways, forexample on a computer readable medium, such as a disc or a memory, or adata signal (for example, by downloading it from a server), or in otherways.

In the claims which follow and in the preceding description of theinvention, except where the context indicates otherwise due to expresslanguage or necessary implication, the word “comprise” or variationssuch as “comprises” or “comprising” is used in an inclusive sense, i.e.to specify the presence of the stated features but not to preclude thepresence or addition of further features in various embodiments of theinvention.

It will be understood to persons skilled in the art of the inventionthat many modifications may be made without departing from the spiritand scope of the invention.

It is to be understood that, if any prior art publication is referred toherein, such reference does not constitute an admission that thepublication forms a part of the common general knowledge in the art inany country.

It will be appreciated by persons skilled in the art that numerousvariations and/or modifications may be made to the invention as shown inthe specific embodiments without departing from the spirit or scope ofthe invention as broadly described. The present embodiments are,therefore, to be considered in all respects as illustrative and notrestrictive. Several embodiments are described above with reference tothe drawings. These drawings illustrate certain details of specificembodiments that implement the systems and methods and programs of thepresent invention. However, describing the invention with drawingsshould not be construed as imposing on the invention any limitationsassociated with features shown in the drawings. The present inventioncontemplates methods, systems and program products on any electronicdevice and/or machine-readable media suitable for accomplishing itsoperations. Certain embodiments of the present invention may beimplemented using an existing computer processor and/or by a specialpurpose computer processor incorporated for this or another purpose orby a hardwired system, for example.

Embodiments within the scope of the present invention include programproducts comprising machine-readable media for carrying or havingmachine-executable instructions or data structures stored thereon. Suchmachine-readable media can be any available media that can be accessedby a general purpose or special purpose computer or other machine with aprocessor. By way of example, such machine-readable media may compriseRAM, ROM, PROM, EPROM, EEPROM, Flash, CD-ROM or other optical diskstorage, magnetic disk storage or other magnetic storage devices, or anyother medium which can be used to carry or store desired program code inthe form of machine-executable instructions or data structures and whichcan be accessed by a general purpose or special purpose computer orother machine with a processor. When information is transferred orprovided over a network or another communications connection (eitherhardwired, wireless, or a combination of hardwired or wireless) to amachine, the machine properly views the connection as a machine-readablemedium. Thus, any such a connection is properly termed amachine-readable medium. Combinations of the above are also includedwithin the scope of machine-readable media. Machine-executableinstructions comprise, for example, instructions and data which cause ageneral purpose computer, special purpose computer, or special purposeprocessing machines to perform a certain function or group of functions.

1. A gaming system, comprising a game controller arranged to: controlplay of a game by selecting a plurality of symbols from a set of symbolsfor play of the game; control the display to display a plurality of theselected symbols in one or both of rows and columns; determine a numberof additional symbols that a player is entitled to, based on at leastone triggering criteria; allow the player to select at least one of theoriginally selected symbols to be replaced by an additional symbol foreach additional symbol that the player is determined to be entitled to;select at least one additional symbol to replace the at least oneoriginally selected symbol as selected by the player; and control thedisplay to display the at least one additional symbol in place of the atleast one originally selected symbol.
 2. A gaming system in accordancewith claim 1, wherein the game controller is arranged to select aplurality of additional symbols to replace the at least one originallyselected symbol as selected by the player.
 3. A gaming system inaccordance with claim 1, wherein the game controller is arranged tocontrol the display to display the additional symbol by appearing toturn over the originally selected symbol to reveal the additional symbolbehind the originally selected symbol.
 4. A gaming system in accordancewith claim 3, wherein the game controller is arranged to control thedisplay such that the originally selected symbol appears to be mountedon a face of a substrate which appears to turn over so that another faceof the substrate appears, bearing the additional symbol.
 5. A gamingsystem in accordance with claim 3, wherein the game controller isarranged to control the display such that the originally selected symbolappears to be mounted on one face of a three dimensional substratehaving a plurality of faces, the substrate appearing to turn over sothat another of the faces of the three dimensional substrate appears,bearing the additional symbol.
 6. A gaming system in accordance withclaim 5, wherein the three dimensional substrate has three or morefaces, and further turns of the three dimensional substrate revealfurther additional symbols.
 7. A gaming system in accordance with claim1, wherein one of the triggering criteria includes enabling the playeran opportunity to obtain one or more additional symbols based on playercredit wagered on the game.
 8. A gaming system in accordance with claim7, wherein the game controller is arranged to provide a number ofchances for a player to obtain additional symbols in proportion to theamount of credit bet, whereby the number of chances of a playerobtaining additional symbols increases with the amount of player creditbet.
 9. A gaming system in accordance with claim 7, wherein additionalsymbols comprise jackpot symbols, and the number of jackpot symbolsavailable as additional symbols is arranged to increase in dependence onthe amount of credit bet by a player.
 10. A gaming system in accordancewith claim 9, wherein the game controller is arranged to increase thenumber of jackpot symbols available as additional symbols in proportionto the amount of credit wagered by a player.
 11. A method of gaming,comprising: selecting a plurality of symbols from a set of symbols forplay of a game; controlling a display to display at least a plurality ofthe selected symbols in symbol positions in one or both of rows andcolumns; determine a number of additional symbols that a player isentitled to, based on at least one triggering criteria; allow the playerto select at least one of the originally selected symbols to be replacedby an additional symbol for each additional symbol that the player isdetermined to be entitled to; selecting at least one additional symbolto replace the at least one originally selected symbol as selected bythe player; and controlling the display to display the additional symbolin the place of one of the originally selected symbols.
 12. A method inaccordance with claim 11, wherein selecting at least one additionalsymbol comprises selecting a plurality of additional symbols to replacethe at least one originally selected symbol as selected by the player.13. A method in accordance with claim 11, wherein controlling thedisplay comprises controlling the display to display the additionalsymbol by appearing to turn over the originally selected symbol toreveal the additional symbol behind the originally selected symbol. 14.A method in accordance with claim 13, wherein controlling the displaycomprises controlling the display such that the originally selectedsymbol appears to be mounted on a face of a substrate which appears toturn over so that another face of the substrate appears bearing theadditional symbol.
 15. A method in accordance with claim 13, whereincontrolling the display comprises controlling the display such that theoriginally selected symbol appears to be mounted on one face of a threedimensional substrate having a plurality of faces, the substrateappearing to turn so that another of the faces appears bearing theadditional symbol.
 16. A method in accordance with claim 15, whereinfurther turns of the three dimensional substrate reveal furtheradditional symbols.
 17. A method in accordance with claim 11, furthercomprising utilising player credit to play the game, and wherein one ofthe triggering criteria includes enabling an opportunity for the playerto buy one or more additional symbols in accordance with player creditwagered on the game.
 18. A method in accordance with claim 17, whereinbuying additional symbols comprises providing a number of chances for aplayer to obtain additional symbols in proportion to the amount ofcredit bet, whereby the number of chances a player obtaining additionalsymbols increases with the amount of player credit bet.
 19. A method inaccordance with claim 17, wherein providing at least one additionalsymbol comprises providing jackpot symbols for winning of a jackpot, andwherein providing opportunities for a player to buy additional symbols,comprises providing additional jackpot symbols in dependence on theamount of credit bet by a player.
 20. A method in accordance with claim19, wherein the number of additional jackpot symbols provided is inproportion to the amount of credit bet by the player.
 21. A computerreadable medium including a computer program comprising instructions forcontrolling a computer to implement a gaming system, the gaming systemcomprising: a game controller arranged to: control play of a game byselecting a plurality of symbols from a set of symbols for play of thegame; control the display to display a plurality of the selected symbolsin one or both of rows and columns; select a plurality of symbols from aset of symbols for play of the game; control the display to display aplurality of the selected symbols in one or both of rows and columns;determine a number of additional symbols that a player is entitled to,based on at least one triggering criteria; allow the player to select atleast one of the originally selected symbols to be replaced by anadditional symbol for each additional symbol that the player isdetermined to be entitled to; select at least one additional symbol toreplace the at least one originally selected symbol as selected by theplayer; and control the display to display the at least one additionalsymbol in place of the at least one originally selected symbol.
 22. Agaming system in accordance with claim 1, wherein one of the triggeringcriteria includes a measurement of time that the player has been playingthe gaming system.
 23. A gaming system in accordance with claim 1,wherein one of the triggering criteria includes a measurement of timeindicating a particular amount of waiting activity on the gaming system.24. A gaming system in accordance with claim 1, wherein one of thetriggering criteria includes a determination based on player trackinginformation.
 25. A gaming system in accordance with claim 1, wherein oneof the triggering criteria includes a determination based on a randomevent.
 26. A gaming system in accordance with claim 1, wherein one ofthe triggering criteria includes a particular symbol combination beingselected in original symbol selection during the game.
 27. A method inaccordance with claim 11, wherein one of the triggering criteriaincludes a measurement of time that the player has been playing thegaming system.
 28. A method in accordance with claim 11, wherein one ofthe triggering criteria includes a measurement of time indicating aparticular amount of waiting activity on the gaming system.
 29. A methodin accordance with claim 11, wherein one of the triggering criteriaincludes a determination based on player tracking information.
 30. Amethod in accordance with claim 11, wherein one of the triggeringcriteria includes a determination based on a random event.
 31. A methodin accordance with claim 11, wherein one of the triggering criteriaincludes a particular symbol combination being selected in originalsymbol selection during the game.
 32. A computer readable medium inaccordance with claim 21, wherein one of the triggering criteriaincludes a measurement of time that the player has been playing thegaming system.
 33. A computer readable medium in accordance with claim21, wherein one of the triggering criteria includes a measurement oftime indicating a particular amount of waiting activity on the gamingsystem.
 34. A computer readable medium in accordance with claim 21,wherein one of the triggering criteria includes a determination based onplayer tracking information.
 35. A computer readable medium inaccordance with claim 21, wherein one of the triggering criteriaincludes a determination based on a random event.
 36. A computerreadable medium in accordance with claim 21, wherein one of thetriggering criteria includes a particular symbol combination beingselected in original symbol selection during the game.